GestureStylus.getDeviceTool

Returns the GdkDeviceTool currently driving input through this gesture.

This function must be called from the handler of one of the [signal@Gtk.GestureStylus::down], [signal@Gtk.GestureStylus::motion], [signal@Gtk.GestureStylus::up] or [signal@Gtk.GestureStylus::proximity] signals.